RESPONSES OF ALANINE DOSIMETERS TO IRRADIATIONS AT CRYOGENIC TEMPERATURES

Present and future high-energy accelerators and particle detectors use and will use superconducting technologies where components are submit ted to radiation in a cryogenic environment. Radiation tests and dosim etry calibration have to be made under these conditions. Alanine-ESR d osimetry is world-wide recognised as a standard method for high-dose m easurements at room-temperature irradiation. From earlier work, the sy stem also seems suitable for low-temperature applications, despite a d ecrease of sensitivity. The aim of the present work was to estimate th e-temperature dependence of five different alanine based dosimeters. T he dose-response functions at 290, 77 and 5 K were determined between 10 Gy and 80 kGy. All the results were consistent among the five labor atories: at a given dose, the amplitude of the ESR signal decreases wi th the irradiation temperature, moreover, this effect is found to be d ose-dependent. Copyright (C) 1996 Elsevier Science Ltd